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Stock-Based Compensation and Shares Repurchases - Common Stock Shares Outstanding (Details) - shares	3 Months Ended		9 Months Ended
	May 31, 2019	May 31, 2018	May 31, 2019	May 31, 2018
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)			164,588,172
Ending Balance (in shares)	152,926,887		152,926,887
Common Stock
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance (in shares)	152,878,329	172,063,230	164,588,172	177,727,653
Shares issued upon exercise of stock options (in shares)	0	0	11,348	29,688
Shares issued under employee stock purchase plan (in shares)	(215)	261	692,110	575,777
Vesting of restricted stock (in shares)	73,095	24,232	1,979,022	2,718,379
Purchases of treasury stock under employee stock plans (in shares)	(24,322)	(6,567)	(489,158)	(790,598)
Treasury shares purchased (in shares)	0	(3,281,412)	(13,854,607)	(11,461,155)
Ending Balance (in shares)	152,926,887	168,799,744	152,926,887	168,799,744

X

- Definition

Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.

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Number of share options (or share units) exercised during the current period.

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